Terahertz electrodynamics and superconducting energy gap of NbN

Kyung Ik Sim, Young Chan Jo, Taewoo Ha, Jong Hyeon Kim, Jae Hoon Kim, Hirotake Yamamori

Research output: Contribution to journalArticle

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Abstract

We have measured the transmission spectra of the conventional Bardeen-Cooper-Schrieffer (BCS) superconductor niobium nitride (NbN) thin films (Tc = 11 K) using terahertz time-domain spectroscopy (THz-TDS) over the spectral range of 10 - 110 cm −1 and the temperature range of 3.9 - 295 K. We extracted both the real part, σ1, and the imaginary part, σ2, of the optical conductivity, σ̃ = σ1 + iσ2, independently and simultaneously, without a Kramers-Kronig analysis. The superconducting gap Δ(T) was observed in the real part of the conductivity, σ1, below Tc = 11 K with a maximum value of 2Δ(0) = 30 cm −1 and the gap ratio 2Δ(0)/kBTc = 3.92.

Original languageEnglish
Pages (from-to)571-574
Number of pages4
JournalJournal of the Korean Physical Society
Volume71
Issue number9
DOIs
Publication statusPublished - 2017 Nov 1

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niobium
electrodynamics
nitrides
conductivity
thin films
spectroscopy
temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Sim, Kyung Ik ; Jo, Young Chan ; Ha, Taewoo ; Kim, Jong Hyeon ; Kim, Jae Hoon ; Yamamori, Hirotake. / Terahertz electrodynamics and superconducting energy gap of NbN. In: Journal of the Korean Physical Society. 2017 ; Vol. 71, No. 9. pp. 571-574.
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Terahertz electrodynamics and superconducting energy gap of NbN. / Sim, Kyung Ik; Jo, Young Chan; Ha, Taewoo; Kim, Jong Hyeon; Kim, Jae Hoon; Yamamori, Hirotake.

In: Journal of the Korean Physical Society, Vol. 71, No. 9, 01.11.2017, p. 571-574.

Research output: Contribution to journalArticle

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T1 - Terahertz electrodynamics and superconducting energy gap of NbN

AU - Sim, Kyung Ik

AU - Jo, Young Chan

AU - Ha, Taewoo

AU - Kim, Jong Hyeon

AU - Kim, Jae Hoon

AU - Yamamori, Hirotake

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